Article R614-16 of the French Intellectual Property Code
The annual fees provided for in Article L. 612-19 which are due for the European patent must be paid under the conditions provided for in Article 141 of the European Patent Convention. These fees are deducted from the filing date of the European patent application. Where the proprietor of a European patent has filed an application for unitary effect, he may pay within a period of three months from the…